Bsi bs en 60127 1 2006 + a2 2015

3.7 universal modular fuse-link miniature fuse-link primarily adapted for direct electrical connection to printed circuit boards or other conductive substrates, incorporating features

BRITISH STANDARD BS EN

60127-1:2006

Miniature fuses —

Part 1: Definitions for miniature fuses

and general requirements for miniature

fuse-links

ICS 29.120.50

12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:

+A2:2015

National foreword

This British Standard is the UK implementation of

EN 60127-1:2006+A2:2015 It is identical to IEC 60127-1:2006, incorporating amendment 2:2015 It supersedes

BS EN 60127-1:2006+A1:2011, which will be withdrawn on

25 March 2018

The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to IEC text carry the number of the IEC amendment For example, text altered by IEC amendment 2 is indicated by #$

The UK participation in its preparation was entrusted to Technical Committee PEL/32, Fuses

A list of organizations represented on this committee can be obtained on request to its secretary

This publication does not purport to include all the necessary provisions of

a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was

published under the authority

of the Standards Policy and

Strategy Committee

on 31 August 2006

© The British Standards

Institution 2015 Published by

BSI Standards Limited 2015

Amendments/corrigenda issued since publication Date Comments

31 July 2011 Implementation of IEC amendment 1:2011, with

CENELEC endorsement A1: modification of text in 9.4

31 May 2015 Implementation of IEC amendment 2:2015, with

CENELEC endorsement A2:2015

ISBN 978 0 580 84977 0

EUROPEAN STANDARD EN 60127-1:2006+A2

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members

Ref No EN 60127-1:2006 E

ICS 29.120.50

English version

Miniature fuses Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links

(IEC 60127-1:2006)

Coupe-circuit miniatures

Partie 1: Définitions pour coupe-circuit

miniatures et prescriptions générales pour

éléments de remplacement miniatures

(CEI 60127-1:2006)

Geräteschutzsicherungen Teil 1: Begriffe für

Geräteschutzsicherungen und allgemeine Anforderungen an G-Sicherungseinsätze

(IEC 60127-1:2006)

This European Standard was approved by CENELEC on 2006-07-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member

This European Standard exists in two official versions (English and German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom

April 2015

Foreword

The text of document 32C/387/FDIS, future edition 2 of IEC 60127-1, prepared by SC 32C, Miniature fuses, of IEC TC 32, Fuses, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60127-1 on 2006-07-01

This European Standard supersedes EN 60127-1:1991 + A1:1999 + A2:2003

The major technical changes concern Subclause 9.2.3 where the nature of the current source has been

clarified; in addition, IEC 60038: IEC standard voltages, has been added to the list of normative

references

The following dates were fixed:

– latest date by which the EN has to be implemented

at national level by publication of an identical

– latest date by which the national standards conflicting

Annex ZA has been added by CENELEC

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN and CENELEC shall not be held responsible for identifying any or all such patent rights

The following dates were fixed:

– latest date by which the amendment has to be

implemented at national level by publication of

an identical national standard or by endorsement (dop) 2012-02-25

– latest date by which the national standards conflicting

with the amendment have to be withdrawn (dow) 2014-05-25

Endorsement notice

The text of amendment 1:2011 to the International Standard IEC 60127-1:2006 was approved by CENELEC as an amendment to the European Standard without any modification

Foreword to amendment A2

The text of document 32C/490/CDV, future IEC 60127-1:2006/A2, prepared by SC 32C "Miniature fuses" of IEC/TC 32 "Fuses" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60127-1:2006/A2:2015

The following dates are fixed:

• latest date by which the document has to be

implemented at national level by

publication of an identical national

standard or by endorsement

(dop) 2015-12-25

• latest date by which the national

standards conflicting with the

document have to be withdrawn

(dow) 2018-03-25

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights

CONTENTS

1

2

3

4

5

6

7

7.1

7.2

7.3

7.4

8

8.1

8.2

8.3

8.4

8.5

9

9.1

9.2

9.3

9.4

9.5

9.6

9.7

Annex C (informative) Audit testing and surveillance – Guidelines for the application of

Scope and object 5

Normative references 5

Terms and definitions 5

General requirements 9

Standard ratings 10

Marking 10

General notes on tests 11

Atmospheric conditions for testing 11

Type tests 11

Fuse-bases for tests 12

Nature of supply 12

Dimensions and construction 13

Dimensions 13

Construction 13

Terminations 13

Alignment and configuration of terminations 13

Soldered joints 13

Electrical requirements 13

Voltage drop 13

Breaking capacity 15

Time/current characteristic 14

Endurance tests 16

Maximum sustained dissipation 17

Pulse tests 17

Fuse-link temperature 17

Annex A (informative) Colour coding for miniature fuse-links 18

the principles of IECEE 03 (CB-FCS) to miniature fuse-links 22

Bibliography 28

Figure A.1– Layout of colour bands 18

Figure B.1 – Example presentation of time/current characteristic, ratio 2:1 20

Figure B.2 – Example presentation of time/current characteristic, ratio 3:1 21

Figure C.1 – Example of a fuse-link description 23

Table A.1 – Colour coding for miniature fuse-links 19

Table C.1 – Audit testing for option 3 26

Table C.2 – Audit testing for option 4 27

Annex ZA (informative) Informative references to international publications with their corresponding European publications 29

Annex B (informative) Example presentations of time/current characteristic 20

MINIATURE FUSES – Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links

1 Scope and object

This part of IEC 60127 covers the general requirements and tests applicable to all types of miniature fuse-links (e.g cartridge fuse-links, sub-miniature fuse-links and universal modular fuse-links) for the protection of electric appliances, electronic equipment and component parts thereof normally intended to be used indoors

Specific details covering each major subdivision are given in subsequent parts

This standard does not apply to fuses for appliances intended to be used under special conditions, such as in a corrosive or explosive atmosphere

The object of this standard is

a) to establish uniform requirements for miniature fuses so as to protect appliances or parts

of appliances in the most suitable way,

b) to define the performance of the fuses, so as to give guidance to designers of electrical appliances and electronic equipment and to ensure replacement of fuse-links by those of similar dimensions and characteristics,

c) to define methods of testing,

d) to define maximum sustained dissipation of fuse-links to ensure good compatibility of stated power acceptance when used with fuse-holders according to this standard (see IEC 60127-6)

2 Normative references

The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition

of the referenced document (including any amendments) applies

IEC 60038, I EC standard voltages

IEC 60127-6:1994, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links

Amendment 1 (1996)

Amendment 2 (2003)

3 Terms and definitions

For the purposes of this document, the following definitions apply

This standard does not apply to fuses intended for the protection of low-voltage electrical

installations These are covered by IEC 60269, Low Voltage Fuses

#

$

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miniature fuse-link for special applications

enclosed miniature fuse-link which is not covered in IEC 2, IEC 3 or IEC

60127-4 and of rated breaking capacity not exceeding 50 kA and having a width and height not exceeding 12 mm and a length not exceeding 50 mm

3.6

sub-miniature fuse-link

miniature fuse-link of which the case (body) has no principal dimension exceeding 10 mm

NOTE Principal dimensions are length, width, height and diameter

3.7

universal modular fuse-link

miniature fuse-link primarily adapted for direct electrical connection to printed circuit boards

or other conductive substrates, incorporating features designed to provide a degree of interchangeability where necessary

non-3.1

fuse

device that, by the fusing of one or more of its specially designed and proportioned components, opens the circuit in which it is inserted by breaking the current when this exceeds a given value for a sufficient time

NOTE The fuse comprises all the parts that form the complete device

homogeneous series (of fuse-links)

series of fuse-links, deviating from each other only in such characteristics that, for a given test, the testing of one or a reduced number of particular fuse-links of the series may be taken

as representative of all the fuse-links of the series

NOTE Fuse-links are considered as forming a homogeneous series when the characteristics comply with the

following:

– the bodies have the same dimensions, material and method of manufacture;

– the caps or other end closures of the body have the same dimensions, materials and method of attachment and sealing;

– the granular filler, if any, of the body is of the same material and completeness of filling It should be of the same size or any variation of the grain size with current rating should be monotonous;

– the fuse-elements are of the same material with the same principles of design and construction; any changes of fuse-element dimensions with current rating should be monotonous;

– the rated voltage is the same;

– for low-breaking capacity fuse-links it is only necessary to test the highest rated breaking capacity in a homogeneous series

– 7 –

time/current characteristics (of a fuse-link)

a) For a.c.: curve giving, under stated conditions of operation, the value of time expressed as virtual time as a function of the prospective symmetrical current, expressed as the r.m.s value

b) For d.c.: curve giving, under stated conditions of operation, the value of time expressed as actual time as a function of the d.c prospective current

NOTE Time/current characteristics usually stated for a fuse-link relate to the pre-arcing time and the operating

time

3.18

conventional non-fusing current

value of current specified as that which the fuse-link is capable of carrying for a specified time (conventional time) without melting

3.19

prospective current (of a circuit and with respect to a fuse)

current that would flow in a circuit, if a fuse situated therein were replaced by a link of negligible impedance

3.20

pre-arcing time (melting time)

interval of time between the beginning of a current large enough to cause a break in the element and the instant when an arc is initiated

operating time (total clearing time)

sum of the pre-arcing time and the arcing time

3.23

virtual time

NOTE The values of the virtual times, usually stated for a fuse-link, are the values of the pre-arcing time and of

the operating time

t i I²t

0d

2

NOTE 1 The pre-arcing I2t is the I2t integral extended over the pre-arcing time of the fuse

NOTE 2 The operating I2t is the I2t integral extended over the operating time of the fuse

NOTE 3 The energy in joules released in 1 Ω of resistance in a circuit protected by a fuse is equal to the value of

the operating I2t expressed in A2 s

3.25

breaking capacity of a fuse-link

value (r.m.s for a.c.) of prospective current that a fuse-link is capable of breaking at a stated voltage under prescribed conditions of use and behaviour

3.26

recovery voltage

voltage which appears across the terminals of a fuse after breaking of the current

NOTE This voltage may be considered in two successive intervals of time, one during which a transient voltage

exists, followed by a second one during which the power frequency or the steady-state recovery voltage exists

3.27

maximum sustained dissipation

power dissipation of a fuse-link measured under prescribed conditions of measurement at the maximum current level that can be sustained for a minimum of 1 h

NOTE 1 The figure for maximum sustained dissipation is used in connection with the maximum power acceptance

of fuse-holders for miniature fuse-links in accordance with IEC 60127-6

NOTE 2 These values are often exceeded for short periods of time immediately before the fuse-element melts Values as high as twice the maximum sustained dissipation have been recorded

or, as specified in the standard sheet for ratings above 6,3 A

#

$

4 General requirements

Fuse-links shall be so constructed that they are reliable and safe in operation and consistent

in performance at any current up to and including the breaking capacity rating and at any voltage up to the rated voltage, when used within the limits of this standard

During normal use of the fuse-link and within the conditions given in this standard, no permanent arc, no external arcing, nor any flame that can endanger the surroundings, shall

be produced During the test for establishing the maximum sustained dissipation and after operation, the fuse-link shall not have suffered damage hindering its replacement and the marking shall still be legible

In general, compliance is checked by carrying out all the tests specified

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Unless otherwise stated in subsequent parts, the requirements for marking are as follows:

a) Rated current in milliamperes for rated currents below 1 A, and in amperes for rated currents of 1 A or more The marking of the rated current shall precede and be adjacent to the marking of the rated voltage

To accommodate existing practice in some countries, for the time being, the current may also be indicated in fractions of ampere

b) Rated voltage in volts (V)

c) Maker's name or trade mark

d) A symbol denoting the relative pre-arcing time/current characteristic as given in the relevant standard sheet This symbol shall be placed before and adjacent to the rated current

These symbols read as follows:

FF: denoting very quick acting

M: denoting medium time-lag

TT: denoting long time-lag

6.2 Marking shall be indelible and easily legible

Compliance is checked by inspection and by rubbing the marking by hand for 15 s with a piece of cloth soaked in water and again for 15 s with a piece of cloth soaked in petroleum spirit

NOTE 1 For petroleum spirit the use of an aliphatic solvent hexane, with an aromatics content of maximum 0,1 % volume, a kauri-butanol value of 29, initial boiling point approximately 65 °C, dry-point approximately 69 °C and specific gravity of approximately 0,68 is recommended

NOTE 2 In the case of colour coding, the test for indelibility need not be applied

6.3 The marking according to 6.1 shall be printed on the packing together with a reference to this standard and an indication of the appropriate standard sheet The marking on the packing shall include the abbreviation A and mA

Compliance is checked by inspection

of colour bands may be used

Such an additional marking shall be in accordance with Annex A

7 General notes on tests

Tests according to this standard are type tests

It is recommended that where acceptance tests are required, they are chosen from the type tests in this standard

7.1 Atmospheric conditions for testing

7.1.1 Unless otherwise specified in subsequent parts, all tests shall be carried out under the

following atmospheric conditions:

– temperature between 15 °C and 35 °C;

– relative humidity between 45 % and 75 %;

Where the above-mentioned conditions have a significant influence, they shall be kept substantially constant during the tests

Fuse-links shall be tested in the specified bases in free air, and be protected from draughts and direct heat radiation The position of the fuse-holder shall be horizontal

If temperature has a marked effect on the results of the tests, these shall be performed at a temperature of 23 °C ± 1 °C

7.1.2 In every test report, the ambient temperature shall be stated If the standard conditions for relative humidity or pressure are not fulfilled during tests, a note to this effect shall be added to the report

Where tests are required at elevated temperatures, these tests shall be carried out at an ambient temperature of 70 °C ± 2 °C, unless otherwise specified

7.2 Type tests

7.2.1 The number of fuse-links required shall be specified in subsequent parts

Fuse-links shall be tested or inspected in accordance with the following subclauses:

BS EN 60127-1:2006+A2:2015 IEC 60127-1:2006+A2:2015

– 11 –

a) Marking (see 6.1)

b) Dimensions (see 8.1)

c) Construction (see 8.2)

d) Voltage drop (see 9.1)

with such additional tests as are specified in subsequent parts

7.2.2 Based on the results of the test in item d) above, the fuse-links shall be sorted in descending order of voltage drop, and numbered consecutively, lower numbers being allocated to the fuse-links having the highest voltage drop Tests from these fuse-links shall then be made in accordance with the relevant testing schedule

If a test is to be repeated, spare fuse-links having approximately the same voltage drop as the original fuse-links shall be used for the repeat test

7.2.3

a) No failure is allowed in any of the tests covered by Clauses 6 and 8, nor those described

in 9.1, 9.2.2 and 9.7 and such additional clauses and subclauses as shall be specified in subsequent parts

b) If in the tests covered by 9.2.1 and 9.3, two failures occur at any one current, the links are deemed not to comply with this standard If, however, one failure occurs, the test shall be repeated on twice the number of fuse-links, at the same current and a second failure shall be a cause for rejection

fuse-If more than two failures occur, the fuse-link shall be deemed not to comply with this standard

c) In each of the tests according to 9.4, 9.5 and 9.6, one failure is allowed If two or more fuse-links fail in any one test, the fuse-links are deemed not to comply with this standard, unless otherwise specified in subsequent parts

7.3 Fuse-bases for tests

For tests that require a fuse-base for mounting the fuse-links, a base according to the requirements specified in subsequent parts shall be used

8 Dimensions and construction

The fuse-element shall be completely enclosed Further details of the construction are given,

as appropriate, in subsequent parts

8.3 Terminations

Fuse-link contacts shall be made of non-corroding material or of material suitably protected against corrosion, and shall be effectively free from flux or other non-conducting substance on their outer surfaces

Nickel or silver plating is deemed to be adequate protection for brass end caps

Tests for firm attachment are given, where appropriate, in subsequent parts

8.4 Alignment and configuration of terminations

Appropriate tests for alignment or position of pins, etc., as applicable, are given in subsequent parts

Compliance is checked by measuring the voltage drop when the fuse-link has carried its rated current for a time sufficient to reach temperature stability

Direct current shall be used for this test; equipment shall be used which does not influence the result of the test significantly

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Temperature stability is considered to be reached when the voltage drop changes by less than 2 % of the previously observed value per minute During this test, the current through the fuse-link shall not deviate by more than ±1 % from the rated current and the accuracy of the voltage drop measurement shall be within a tolerance of ±1 %

NOTE 2 Problems can arise when fuse-links are used at voltages considerably lower than their rated voltage, mainly for low ratings Due to the increase of the voltage drop when the element of a fuse-link approaches its melting point, care should be taken to ensure that there is sufficient circuit voltage available to cause the fuse-link

to interrupt the current when an electrical fault occurs Furthermore, fuse-links of the same type and rating may, due to difference in design or element material, have different voltage drops and may therefore not be interchangeable in practice when used in applications with low circuit voltages, especially in combination with fuse- links of lower rated currents

9.2 Time/current characteristic

9.2.1 Time/current characteristic at normal ambient temperature

The time/current characteristic shall be within the limits specified in the relevant standard sheets

Compliance is checked by measuring the pre-arcing time under the atmospheric conditions mentioned in 7.1

The current through the fuse-link shall be adjusted to within ±1 % of the required value The current stability during the test shall be maintained within ±1 % of the adjusted value The voltage of the source shall not exceed the rated voltage of the fuse-link under test The accuracy of the measurement of time shall be within a tolerance of ±5 % for times of less than 10 s and ±2 % for times of 10 s or more

In the case of very short pre-arcing times at high levels of the current where constant current

calculated

9.2.2 Test at elevated temperature

When specified on the standard sheet, fuse-links shall also be tested for 1 h at an ambient temperature and with the multiple of the rated current as specified on the relevant standard sheet

The current stability during the test shall be maintained within ±2,5 % of the adjusted value The fuse-link shall not operate

9.2.3 Test procedure

Direct current shall be used for these tests

NOTE 1 Direct current is used because it is easier to control and eliminates the variation inherent with alternating current caused by the point on the voltage wave that switching occurs

NOTE 2 Care should be taken that the arcing time is not included in the total time measured

The output voltage of the current source shall be sufficient to limit the variation of current during the pre-arcing time Additionally, the output voltage shall not exceed a value declared

by the manufacturer and chosen from the list of d.c voltages in Table 6 of IEC 60038

The time constant of the circuit shall not exceed 3 % of the pre-arcing time

Where there is a possible influence of the Peltier effect, care should be taken to reverse the direction of the current passing through the fuse-link for each successive sample

NOTE 3 Where the influence of the Peltier effect is essentially due to the construction, the time/current

characteristic should be tested with twice the number of fuse-links at 2,0 IN or 2,1 IN The additional samples may

be taken from the spare fuse-links